Convective blueshifts in the solar atmosphere - I. Absolute measurements with LARS of the spectral lines at 6302 Å

Home

All issues

Volume 611 (March 2018)

A&A, 611 (2018) A4

Full HTML

Free Access

Table 2

Center-to-limb variation of the convective shifts.

Spectral line			Heliocentric parameter μ = cos Ө

Element	λ₀ (Å)	Part	1.0	0.95	0.9	0.85	0.8	0.7	0.6	0.5	0.4	0.3
Fe I	6301.5008	Line core	− 107	− 74	− 81	− 99	− 82	− 101	− 64	− 18	+ 33	+ 85
		Mean bis.	− 295	− 244	− 251	− 269	− 246	− 271	− 255	− 206	− 156	− 87
		Synthesis	− 307		− 349		− 358	− 351	− 325	− 279	− 211	− 101
Fe I	6302.4932	Line core	− 164	− 139	− 163	− 195	− 178	− 204	− 173	− 115	− 47	+ 33
		Mean bis.	− 295	− 249	− 262	− 281	− 260	− 286	− 274	− 221	− 170	− 94
		Synthesis	− 335		− 387		− 404	− 403	− 381	− 342	− 280	− 176
Fe I	6303.460	Line core	− 420	− 398	− 394	− 423	− 392	− 434	− 420	− 385	− 359	− 277
		Mean bis.	− 422	− 388	− 390	− 419	− 381	− 444	− 455	− 417	− 402	− 347
O I	6300.304	Line core	+272	+327	+306	+265	+263	+224	+232	+221	+201	+235
		Mean bis.	+ 214	+ 262	+ 241	+ 201	+ 232	+ 169	+ 142	+ 161	+ 163	+ 191
Sc II	6300.6795	Line core	− 387	− 316	− 351	− 372	− 338	− 382	− 387	− 355	− 294	− 241
		Mean bis.	− 344	− 288	− 312	− 339	− 298	− 357	− 366	− 332	− 304	− 257
Si I	6299.590	Line core	− 253	− 223	− 253	− 296	− 277	− 334	− 328	− 269	− 185	− 48
		Mean bis.	− 484	− 460	− 485	− 515	− 482	− 534	− 530	− 467	− 385	− 259
Ti I	6303.7565	Line core	− 353	− 317	− 331	− 366	− 335	− 380	− 379	− 342	− 296	− 225
		Mean bis.	− 347	− 304	− 325	− 354	− 320	− 379	− 395	− 353	− 324	− 277

Notes. The Doppler velocities (in m s⁻¹) were obtained either from the line core position or the mean bisector. The heliocentric parameter μ is the cosine of the heliocentric angle θ, ordered from the disk center (μ = 1.0) to the solar limb (μ = 0.3). Line core velocity was determined by a parabolic fit to the intensities around the line minimum. The mean bisector is the average of all bisector centers from the line core to the spectral continuum. For the deeper lines Fe i 6301.5 Å, 6302.5 Å, and Si i 6299.6 Å the upper threshold was set to 95% of the continuum intensity. The values of the synthesis (same threshold region) were taken from Table 2 of de la Cruz Rodríguez et al. (2011). For the weaker lines Fe i 6303.5 Å, O i 6300.3 Å, Sc ii 6300.7 Å, and Ti i 6303.8 Å, the upper intensity level was defined as 98%.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.